Expiratory time Te can be calculated as Te equals TCT minus Ti. Which option shows this relationship correctly?

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Multiple Choice

Expiratory time Te can be calculated as Te equals TCT minus Ti. Which option shows this relationship correctly?

Expiratory time is the portion of the respiratory cycle that remains after the inspiratory phase. The total cycle time (TCT) is the sum of the time spent inhaling (Ti) and the time spent exhaling (Te): TCT = Ti + Te. Solving for Te gives Te = TCT − Ti, which is why this relationship is correct. For example, if the total cycle time is 4 seconds and the inspiratory time is 1.5 seconds, the expiratory time is Te = 4 − 1.5 = 2.5 seconds. Other forms don’t fit because they either imply no expiration (Te = Ti), compute a ratio (Te = TCT / Ti), or add times instead of subtract (Te = TCT + Ti).

Expiratory time is the portion of the respiratory cycle that remains after the inspiratory phase. The total cycle time (TCT) is the sum of the time spent inhaling (Ti) and the time spent exhaling (Te): TCT = Ti + Te. Solving for Te gives Te = TCT − Ti, which is why this relationship is correct.

For example, if the total cycle time is 4 seconds and the inspiratory time is 1.5 seconds, the expiratory time is Te = 4 − 1.5 = 2.5 seconds.

Other forms don’t fit because they either imply no expiration (Te = Ti), compute a ratio (Te = TCT / Ti), or add times instead of subtract (Te = TCT + Ti).

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